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This topic comprises 2 pages: 1 2
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Topic: Tom Cruise urges viewers to disable motion smoothing TVs
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 03-05-2019 02:49 AM
There is a difference between "jitter" and "judder", no matter what field you apply to it.
Jitter contains a random factor. For example, aligning the frame to the gate always contains a bit of a random factor, simply due to mechanical constrains. The maximum amount it can differ from the norm can be a quantifiable number, but how much it differs in each direction per projected frame is generally unpredictable.
Jitter is also often used in telecommunications, especially on so called packetized networks like the Internet. If you send a bunch of packets to me, due to how the internet works, there will be a variation in latency between the packets. This variation is jitter. Jitter is especially problematic in real-time applications, like Voice and Video over IP.
Jitter is much like a random vibration.
Judder is probably a less defined term, and maybe in this context not even entirely correct. It's not an artifact with a random background though.
Judder is traditionally being used to describe the motion artifacts of the 3:2 pulldown necessary for the conversion between 24 and 30fps for broadcast on 60Hz systems.
I'm using it to name the obvious artifacts you get from a relatively low frame rate on certain scenes. Although the cause is not the same, the look is somewhat similar, hence I'm calling it "judder". It's especially the artifact, where the fluency of the motion breaks up and the individual frames start to become apparent. This primarily happens in faster panning shots. Most motion compensation fixes this artifact pretty well, but it also introduces the dreaded soap-opera look. If I have to choose between the occasional "judder" and soap-opera look, I'll go for the first one.
If there is a better term than judder for this (there probably is), then I'm all ears.
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